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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c3f16d0aaa53d5214f452ae1f8b65125845b6b46eb0aeeb1d0c1c47bd20801' 
  AND token = 'GxrdgcSdKKndR0gybg9h0t7zotQ71jpJFgMcrNENuwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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