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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34c9c03f73c85f98f28156544be2d66d867be2925dc12796d72b5d587f0607b' 
  AND token = 'r6cMgRu2nMpC2YLevzEkPefm5OkjWJew4Xz1qfjDnwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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