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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971a8ec1640cf1c6ea29b42441fc1f8d73cb11a742fc5ff0cb5c4dd27efc275a' 
  AND token = 'TyOSbvz5bR0Xc957Ac7Mtrff58NstV7+Fu0Y0pw6/vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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