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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2f8c8bdaff64aa15f94561d8a314e834ed7512b92ef5502b560cbb90ef7f63' 
  AND token = '0Vg0EW0mIRmuF/HYA6MUW4KbU2yJFkgOKXhf6bksWEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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