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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4757f5ee5aed2c615152b4ab1b653a5f6c2603e919146a3955c23580b699a1' 
  AND token = 'Ks/a7z9ZpRB0osF1K6iYI7Z5bqwDrK8u5dJSSdywpv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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