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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e20617a795cb34a902e7a048afda71d3169097bdc868ae8ede33673733466f2' 
  AND token = 'Xn2ttjGUZMk3ZgNYix/9BHqw2t98/b7AHO+F1u5FEWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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