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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e080a10e28ad4a9b9e8d207dbdfd28f33e0b6da23b8ed9f1a034ce85f830c5e9' 
  AND token = 'G2UJDxIVDZjXs2j3nLE6lQ8US6hUnCxX4AJ2AzvASz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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