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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893c1e6fa85359c7ff949b5381a5d1ac5eed0068d3786525fb02b1b1ed875347' 
  AND token = 'M0Hno2aMAs9Jl2aT0sHVrl6Bqo8uknWl8KlOHWmSvPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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