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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca08d575a1779838a5da06ff71f9a274c622a85785b438228edd0dbaef9b328' 
  AND token = '3I+/s5ehiwVOLBLh2HNT3DKzUEnL55jNT8cuM1qNrdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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