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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933413d4ae7253651174127251a5a8838ab87d808150632aa3ad75d66f01567c' 
  AND token = '0PvKsdJ6Lwd7W/PZzxUEEvbShlyfu6p8CAZTPQcd4rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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