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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a5557bf55d6ec9b38c4d3ed079fda0fd80e9fb3b0a293b0cbeb53fb70c4e9f' 
  AND token = '3jvZVHNMOutY4//uIhU0YcuaABcvhqD/XzSn63uUTi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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