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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc9278ba849f448c4bd35b0d036a4e778c1b92b9a7c9c3dc4953ef7d384ed0d' 
  AND token = 'YTRyw+kxOzy3SesC6EaB9f54m4urRdZOCargzPDIKBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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