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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139086f908518f2db538d7bff3e3af0ad08ea0c916ae96b32c9e7ebcae6d6ef6' 
  AND token = 'jl0j4Wz03Gsu06XCtChgGZXwGX91PeqfNDh8sUnRsZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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