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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329ae2ae8b5f21cd606fab322d8e15a6e14082145f70dfbd69ebfb5c7e1a96f0' 
  AND token = 'BQiHum3eo+zV6UoraGXMZuhn4XffSjZuAInxy+pGo14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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