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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea4ca4c7f0b069b75c9b7fb7249c84a92e17e868809306e1315ae608ea43a4d' 
  AND token = '1MJqdk7UxgdpdwDSQOF1/M/j6AfiSuKY3mzInfAWlo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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