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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f790eb2040e259351be2bf572f8b0943c5174176782137b5dc9576e2b20fa5' 
  AND token = 'jFt+CM8rbZzXRh8ba119bVtX1ZxHXsNtAowCfNYgeWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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