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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6646f60484b95feb445ed4794c2f38228bd0f71546b4e4c5f8fa5c464c26a2' 
  AND token = 'nWKkIEdG5EHVvP8UjLqezXHMUMipCOFZKGAtrLSaB4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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