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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1920a8bb26c9875a9b5607e8160b57e52d621d4d3b77237fa4a1e8c268db0a' 
  AND token = 'O3OVcj4Qs57/02Gjx7KxbuPSunrxCUShfudcDgDRUa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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