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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ba15f4a7487fe1d3ac45a453c575b90e3e4e24ddfaf3bc8ddad89b0359b95e' 
  AND token = 'HYKhjxYUZnyGbwf5AyeMYTempAwFa8PIeGTfT3iE44U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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