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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1749e1730807d311b1e2b62f5c62474e68c8bc0427af9a4da4ff07debfe5c1d' 
  AND token = 'tH/k+xmn6cSPrhLtQecVbs6HJtOYXFcuERBJTl5pElU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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