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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f268abfab909439c2470fa4bb46e155e9d2a4d95ebaeae8a6096a4f06a3e99' 
  AND token = 'K5iznFBz1/NiV8bXl15agfPLa6H/cjXwJbV5dVQJq8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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