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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a2b8c1f3ba04e5341e8cfa74026a0e05942cd0522408d437fb0cb6ab7e586a' 
  AND token = 'kb+us84xKeYCxObA0dafd61mPO+uORdVcwRHsk4QqqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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