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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57669dc87cea57de85ecaef6bea63efec9cd9421d5f4ba452b0b47667eac48eb' 
  AND token = 'A5eSnbpe6CU1z8GkFqIQocSDZ3YQCkD76Y0kA5GtfhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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