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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9deefcb34c5df85bc5ead1c79b245029042a106db2135ba46753c0d3d521ab0' 
  AND token = 'QRGj2SqWcNH/Vu9t4sVpn/dvczFIQ6TEMlTthJnS0Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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