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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd80258f17c7e91e38920194eccf0c7616aa8372acc978e04cf0bf7d304ee86' 
  AND token = '7UbS3lWnEnjZL/J+S7U+FFuCoEvIhnJGajd+4xKwfrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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