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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126eab0c11eaa7719af230d860cc6e77d465d87765cc25c316c00bd1d66f5c7d' 
  AND token = 'GWc4vBYhrU/+q4SUEidVOby9VQHRDzwX31aPFo60S7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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