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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8769d9c23470ed70e3bf263b8e4baa0d537bb3a848ad37c924221027ec8ac5' 
  AND token = 'mNvBcijBoc8k5Jv0qz8bCV53BW+YodFTjQNl5R8nlG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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