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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0903ff75678f9733b1c932bb55b9ee71f41615058bc196c01da796ec801b1588' 
  AND token = 'n7FPM5d8g7/xU0q8i/yW+Xx7tQ+yanoGAtnbkO9JjqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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