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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2779a8b4c9cc4b33b4d5c2c4d90f8a3c5610e19f5d2c11bfbdfdc97c2bed6f84' 
  AND token = 's3yIct1sBi9S5E9XLmkfm91lgBLf2gIykRg3m53m/CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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