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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e61d464f4b67ab4cffdd4dd90eacb19f01aa17ab06a8e7b19c3894d5265841' 
  AND token = 'aleEc2W5ZICNv+yEDrdh3M8pskVYj43er4Gf7WRINng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}