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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e303e5aeb5d08ee48e0f53589bd9bad00c8af924b1446b91644f7da02ee575' 
  AND token = 'UDeuNoNVYuT+zbyiwHHHxae5CwA52GKg5WcJNym5f+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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