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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004b2454faa188063e1652cb198ff3c945ed61c060141d1475dc8cb1c6b1cafb' 
  AND token = '+IZNlPpbCTPivPgq94Rsx6aeDkxsEmj23yR0GxNRv9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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