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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750e1e92710095653fa4acf098de0e842d4b14b420ed0b5890371137625cb8f3' 
  AND token = 'Z9M7UxZLTCNyE91N+xxmse2h629eCCeqX7wI0v0ouI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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