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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56c5172205bfecd7173b04a50d82b1ad596b91f21dbbb1fbf0b2f3bbd558a2a' 
  AND token = 'eZ4Ao08MOluCjoq2wi/5sdMMwm8BUymuaVKL4eyU+aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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