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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd805040e32197b1cd3c9a3a138bef1d46ef73bfe6d68375c01001a5f174b2458' 
  AND token = 'yYwBg1RwVKyTrf76GDerM/s3D4N88pbKj3OzF9ZY1EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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