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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335b2e9985a9722df4ea9855b6df6e9a89bebe573bb372280cbb8856c522ea31' 
  AND token = 'yzzhlKPzcMhukrc1wDf/XdkX6De/7NBoKYl+YlG+2R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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