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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b63f510749768d5c50e86563e67a0124073a570e6ab1678766b8033bcea17bb' 
  AND token = 'okCnoaKSAzWrfrXur27VGfVvcWVPzwJhhfEJL9kM5RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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