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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2898230f20d495789d3a9862a5b37c06e9119726822994ac1072e7a5897dff' 
  AND token = 'HgjH9BxdIMOPj8EVTLPmpWZN7nwlvIp0i+SJVWxap+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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