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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd56099048d2156edc18d6916f7e7df081deb0c2b7268e227fdaf40da8496b03' 
  AND token = 'NeyRYKQ3f6i5HUOuPT2qG4oTujYIC7SU1PMndfhBvgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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