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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3756873c9679116c19505fffec78318ec363ce6a2554079941b5f1c8eb3a01d2' 
  AND token = '6nw5YehDxlfP8n2635IVbAFnchqgUB++YTrgMLOH7ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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