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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34670f41a2ee6122b1729323384f8292baff7042945854831ad067750e7c3723' 
  AND token = 'tPub1F+80A+zNyhmU395c3gQ/mYPPb60tP9gxHyX0m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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