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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb015d6c92f155123ac35a8fdec618eeb03fc2a3612173ee732018ea02322404' 
  AND token = 'XGfPzvaAx3nK1zniD8Sel4Pdn1kof5bQekJ2er5s1bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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