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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f829847ef33fee7b48a4a08b02f081e6658a9fb8ceb731894c378752351c10e1' 
  AND token = 'h00oKzN2nHmvZdQtg33YrUmUU47aLdyC1dd9bxCDbOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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