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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd3547920cd8b3b73acdcbeada173ffa9236c82c327a9718f92a52b899fdce1' 
  AND token = 'H3XqfitB2ohp1yBo702j4xCwDrn4YrjKox5Xt1DT8u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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