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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e885b52eb24d055e3bbb6e4d05b4339d25acdc9858e01de7303c717a94136f' 
  AND token = 'A52FjvvKWe6FTrFt8KrsjLhUg8lgawCSVwZrAZoiX90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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