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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22098ebcb535090fa086d5cb0f2bafd1d3198264af4409c41fca9c932fc21cfd' 
  AND token = '0b/Z3NQ5q/J/xQiIYajFnWp+nrIqfO/PrzeBT9jl5z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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