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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593e7d2a3ae0260a4bf1f4558af19f70b44f08537540defced4373204c6a3003' 
  AND token = 'xk8BSxs1ooiggDqyWT85IAccg8P1hroVClW2JIGTq60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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