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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262629342d7eca810e1a421f084e52372a6ca6425b626ced36e23c5d0023fff4' 
  AND token = 'ilcHaOZnr8O2M94B+YuMfBmu3UFQg5MBSk+6OQ4pVUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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