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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0983f3ff3e1cc681e228d1677eb6e20d8267b0b2e96b8d734bf74ea1a4c18244' 
  AND token = 'tKjxbkbEdWEhvYLhiCjNsHomeQ2zF3CcwC5Ucb0829I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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