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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d027a2c08357f3d975ca21746923b691643192e170a5200160957ff74b26d02' 
  AND token = '2C/7jrDCnK2XE8xlnc03drpHO7J9Za/qcCSTswCCL0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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