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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61b81445b10ee8a7f95997f12b90a97aea3f66bc64df272bf88334fae38e0fa' 
  AND token = 'hoh5Cd+gAJnX+jr3cyAE9B7CgmF+t8oFK+R13mRxhjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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