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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0857e2c4fa147e16f4100e9fbf42851e863458c8aef6cf09a23d8eea60d8bc3' 
  AND token = 'eayQVX7lUTAL/E2REsQchfA7R2MjaL+un1gXZtS8amo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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