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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e5c596401f2060b49a0f47cd9267269b4f8e650dfa333055fa5dd87f95a384' 
  AND token = 'Q3gK6PPlBdanutyKtX3fy8To8qB5FwwmYIhvDt0tEkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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