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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c3487d6feb236261549000aa9d941f7179914ba3624500afb6c0ee013d8491' 
  AND token = 'jU4iJif1su3YTT8ecXIioWb1OrirdzRFUSbWnpoa7qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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