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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b984d4427359ea93da239db04a6a757699efcc3115612eea8cde4176a07cb1a3' 
  AND token = '6Cf0Kl2nscK/dHazWlvZ2XblihRO3Rev2HMEXnEOlnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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